This Yearbook of Global Climate Action - the fifth of its series - reviews the work carried out under the Marrakech Partnership and the High-Level Champions since the last publication, by; (1) summarizing the state and scope of global climate action in 2021 and the challenges and opportunities around how to track and reflect these efforts, as well as the progress of the global action tools launched in the past year; (2) outlining the key messages around what is needed to accelerate sectoral systems transformation; and (3) presenting the Champions’ vision on the future of the climate action framework and agenda, and how the work feeds into the global stocktake.